▎ 摘　　要

NOVELTY - A nitrogen doped carbon-coated molybdenum selenide/graphene core-shell array sandwiched composite material preparing method involves preparing solution A and solution B. The solution A and solution B are mixed evenly to form a reaction solution and vertical graphene collector material is grown on the carbon cloth and placed in reaction liquid, washed and dried to obtain VG-MoSe2 core-shell array structure. The array structure is immersed in aqueous solution of dopamine hydrochloride, washed and dried to obtain core-Shell array structure of dopamine, followed by sintering, and carbonizing. USE - Method for preparing nitrogen doped carbon-coated molybdenum selenide/graphene core-shell array sandwiched composite material that is utilized as sodium ion battery cathode material (claimed). ADVANTAGE - The composite material has high reversible charge and discharge capacity, long cycle life and excellent rate performance when used as a sodium ion negative electrode material. DETAILED DESCRIPTION - A nitrogen doped carbon-coated molybdenum selenide/graphene core-shell array sandwiched composite material preparing method involves dissolving selenium powder in hydrazine hydrate to form solution A. The solution of molybdenum is mixed with water to form solution B. The solution A and solution B are mixed evenly to form a reaction solution and vertical graphene collector material is grown on the carbon cloth and placed in the reaction liquid, subjected to a hydrothermal reaction, washed and dried to obtain VG-MoSe2 core-shell array structure. The VG-MoSe core-shell array structure is immersed in an aqueous solution of dopamine hydrochloride, polymerized in a water bath, washed and dried to obtain core-Shell array structure of dopamine, followed by sintering core-shell array structure, carbonizing under high temperature carbonation atmosphere to obtain product.